Other PDF Issues

Fix Adobe Acrobat Mobile App Crashing on Comment or Fill & Sign

Khadija Khan Oct 19, 2026 868 views

Question details

The user experiences sudden app crashes when attempting to add comments, highlight text, or utilize the Fill & Sign feature in the mobile PDF application.

How to Fix Adobe Acrobat Mobile App Crashing When Commenting or Using Fill & Sign

Product: Adobe Acrobat Mobile App
Device & OS: Android (e.g., Samsung Galaxy Note 4)
Scenario: Highlighting text, adding notes, or applying a signature to a PDF document on a mobile device.
Observed behavior: The mobile application unexpectedly crashes and closes immediately after applying a comment, highlight, or signature.

Before you start

Ensure your mobile device operating system is up to date and that you have backed up any offline copies of your PDF files to avoid data loss.

Solution 1Recommended

Change Your Device Language to a Supported Locale

Unsupported device languages, such as Bulgarian, can cause the app to crash during text input. Switching to a universally supported language like English resolves this.

A known bug in certain application updates triggers crashes when the system language is not fully supported by the app's internal text rendering engine.

Open Settings

Navigate to the Settings app on your Android mobile device.

Access Language Options

Scroll down and tap on General Management or System, then select Language and Input.

Change Device Language

Tap on Language, add 'English' (or another supported language), and set it as the primary system language.

Relaunch the App

Open the Adobe Acrobat app again and attempt to add a comment or signature to verify the fix.

Change Your Device Language to a Supported Locale

Language Change Successful: Once the crash is bypassed and your document is saved, you can revert your phone back to your preferred local language if needed.

Solution 2

Sign Out, Restart Device, and Reinstall the App

Refreshing your session and ensuring a clean installation can fix temporary glitches or corrupted app data causing the crash.

Best Mobile PDF Editor

Use WPS Office to Add Comments and Fill & Sign PDFs on Mobile

Avoid mobile app crashes by using WPS Office. It provides robust, stable mobile PDF tools for highlighting, commenting, and signing documents securely on the go.

1. Install WPS Office: Download and open the WPS Office app on your mobile device.
2. Open Your PDF: Tap the 'Files' tab and select the target PDF file from your local storage or cloud drive.
3. Access Annotation Tools: Tap on 'Tools' at the bottom of the screen and select the 'Annotation' tab to add comments or highlights.
4. Sign the Document: Switch to the 'Fill & Sign' or 'PDF Signature' option within the Tools menu to easily sign your document.
5. Save Changes: Tap the 'Save' icon in the top left corner to ensure all your highlights, comments, and signatures are securely applied.

Highly stable mobile app preventing crashes during edits and annotations.Full format compatibility with all standard PDF files and Microsoft Office documents.Free, lightweight application for comprehensive mobile document management.

microsoft office alternative - wps office

Frequently Asked Questions

Why does my PDF app crash only when I try to highlight text?

This is often caused by a conflict between the app's recent update and your device's regional or language settings. Switching your device language to English usually resolves the conflict.

Will I lose my PDF annotations if the app crashes?

If the application crashes before an auto-save triggers, unsaved annotations or signatures may be lost. It is highly recommended to save frequently or use a more stable editor like WPS Office.

How do I report persistent crashes to the app developer?

You can contact support or email their Android development team directly. Be sure to include your device's operating system version, the problematic PDF file, and details of the comments you were trying to add.

PDF Troubleshooting